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%遗传算法 VRP 问题 Matlab实现 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% clear;clc load matlab.mat Sup_Parent=[3 6 7 17 18 5 8 16 19 15 26 25 4 27 29 2 9 14 20 28 30 31 13 22 21 24 11 12 23 10]-1; G=100;%种群大小 Parent=rand(G,30);%随即父代 for i=1:G [m n]=sort(Parent(i,:)); %初始化数据 Parent(i,:)=n; end Pc=0.8;%交叉比率 Pm=0.2;%变异比率 species=[Sup_Parent;Parent];%种群 children=[];%子代 %fitness_value(4070,1)=0;%适应值 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% g=input('更新时代次数'); for generation=1:g %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Parent=species;%子代变成父代 children=[];%子代 %选择交叉父代 [n m]=size(Parent); % select=rand(1,n)<Pc; % select=find(select==1); %交叉 for i=1:n for j=i:n if i~=j & rand<Pc jiaocha end end end %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% for i=1:n if rand<Pm parent=Parent(i,:);%变异个体 X=floor(rand*30)+1; Y=floor(rand*30)+1; Z=parent(X); parent(X)=parent(Y); parent(Y)=Z; %变异 children=[children;parent]; end end %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %计算子代适应值 [m n]=size(children); fitness_value_c=zeros(m,1);%子代适应值 for i=1:m l1=1; for l2=1:n if sum(data(children(i,l1:l2),3))>25 fitness_c l1=l2; end if l2==n l2=l2+1; fitness_c end %计算适应值 end end %计算父代适应值 [m n]=size(Parent); fitness_value_P=zeros(m,1);%父代适应值 for i=1:m l1=1; for l2=1:n if sum(data(Parent(i,l1:l2),3))>25 fitness_P l1=l2; end if l2==n l2=l2+1; fitness_P end end end %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %淘汰子代 [m n]=sort(fitness_value_c); children=children(n(1:G),:); fitness_value_c=fitness_value_c(n(1:G)); %淘汰父代 [m n]=sort(fitness_value_P); Parent=Parent(n(1:G),:); fitness_value_P=fitness_value_P(n(1:G)); %淘汰种群 species=[children;Parent]; fitness_value=[fitness_value_c;fitness_value_P]; [m n]=sort(fitness_value); species=species(n(1:G),:); fitness_value=fitness_value(n(1:G)); %更新世代 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% end species(1,:)%最优线路 fitness_value(1)%最优费用